Troubleshooting
Leuze electronic
MLC 520 EX
46
Table 11.2:
Receiver LED displays - causes and measures
11.3 Error messages 7-segment display
Table 11.3:
Messages of the 7-segment display (F: internal device error, E: external error, U: usage
info during application errors)
LED
State
Cause
Measure
LED1 OFF
Device failed
Replace the device.
Red
(7-segment display dur
-
ing start-up: C1 or
C2 according to the
number of green LEDS
on the transmitter)
Alignment incorrect or
protective field inter
-
rupted
Remove all objects from the protective field.
Align the transmitter and receiver to each
other or place blanked objects correctly con
-
cerning size and position.
Red
(7-segment display dur
-
ing start-up: C1 . LEDs
on transmitter: both
green)
Receiver is set on C1,
transmitter on C2
Set the transmitter and receiver on the
same transmission channel and align both
correctly.
Red
(7-segment display dur
-
ing start-up: C2 . LED1
on transmitter: green)
Receiver is set on C2,
transmitter on C1
Remove all objects from the protective field.
Align the transmitter and receiver to each
other or place blanked objects correctly con
-
cerning size and position.
Red, slowly flashing,
approx. 1 Hz
External fault
Check the connection of the cables and the
control signals.
Red, flashing fast,
approx. 10 Hz
(7-segment display
F x y )
Internal fault
If restart fails, exchange the device.
Green, slowly flashing,
approx. 1 Hz
Weak signal due to con
-
tamination or poor align
-
ment
Clean the front screens and check the align
-
ment of transmitter and receiver.
LED2 Yellow
Start/restart interlock is
locked and protective
field is free - ready for
unlocking
If there are no people in the danger zone,
operate the reset button.
Yellow flashing
The control circuit is
open in operating
mode 1, 2 and 3
Close the input circuit with the correct polar
-
ity and timing.
Faults
Cause/description
Measures
Sensor behav
-
ior
F[No. 0-255] Internal fault
In the event of an unsuccessful
restart, contact customer service.
OFF
Very high overvoltage (
40 V)
Supply the device with the correct
voltage.
E01
Cross connection between
OSSD1 and OSSD2
Check the wiring between OSSD1
and OSSD2.
Automatic reset
